The Sikh concept of the after-life is much more descriptive than any other faith.

Here is a fundamental question that no other faith can answer, including Islam. If a baby is born and screams one scream and then dies, what will happen to its soul? What was the purpose of its existence? If we believe in one coming and one going, then the birth of this baby makes no sense. It had no life to live and could not do anything and so will it go to Heaven or Hell? And why did God give this person such a short life in which it could do nothing?
No answer can be given to this question by Islam.

On the other hand, Sikhism believes that everything is a result of karma. The child's karma, due to its past actions resulted in this one act that it must perform before its demise, once its karma was completed it left the world on its continuing journey towards the Almighty. A human can only break free from the eternal circle of life and death by meditating on Gurmat Naam and immersing the self into Akaal.

Let us take the concept of the Day of Judgement. Islam believes that on this day all will rise from the dead and the dead will be judged. Now, this Day of Judgement is a long way off. What happens when a person dies and is buried and his body decomposes, and in time that soil is used to nurture plant life which in turn gets eaten by another human being.

When this second person dies and is buried who will rise on the Day of Judgement?

Will it be the original person or the second person who has consumed the first? How can it be the first person since he is now part of the second? Since people have been living and dying for thousands of years and will continue to do so then how will the original people rise from their graves when they are now part of a myriad of other life forms? This body is but a mere vessel for our atma or soul, once we die we have no use for it and it is discarded, hence the reason why Sikhs creamate rather then bury thier dead.

Sikhism believes that it is the soul that is eternal not the body, the body is just a shell that we discard when we die.

According to Sikhism, when a person dies, his soul is taken to the court of Dharam Rai. This is a very painful journey in which the soul of the manmukh (one without the Guru) encounters much hardship. Once in the court of Dharam Rai, his account of deeds is read to him and he cannot deny anything. He cries that he did not take advantage of human life and become one with Akaal. He is then given his sentence. This will be according to the fruits of his deeds. Heaven and Hell are not permanent places. They are not where a Sikh wishes to go. They are simply transitory places where one receives either pleasure or pain.

To deceive a person into converting to ones own faith is a mighty sin and punishable when one passes into the afterlife. There are NO 72 virgins to command at your whim. There is no carnal knowledge with these maidens, there is no lakes of wine, the people who believe in this have been sold lies. Just think about it, why would God need to entice people towards Him with false pleasures, the love of Him should be more then enough. These are all lies to lock people into a particular doctrine. Sikhs do not need to offer any such enticements; their love for their Guru is enough.

There are five Khands or realms: the first is Dharam Khand in which all souls must appear to receive their account in the court of Dharam Rai. The next realm is Giaan Khand in which reside countless gods and goddesses and angels and also beings like Buddha and other prophets. After this realm is Sharam Khand. Sharam Khand is a level that cannot be understood by the human mind. In it, the mind and intellect are re-shaped to see and understand new realities.

All the above mentioned places: heaven, hell, Dharam Khand, Gian Khand, Sharam Khand are all transitory. Beyond these are "true" realms. These are Karam Khand and Sach Khand. Karam Khand is for true devotees of Akaal who have meditated on him and Sach Khand is where Gursikhs go who have meditated on Gurmat Naam and become one with God. Here they are forever immersed in bliss and unity with God and forever sing his praises.

Clearly then, this system is different than any other faith. It is not "borrowed" from or has connection with Hinduism.

“If anyone asserts the fabulous pre-existence of souls, and shall assert the monstrous restoration which follows from it: let him be anathema. (The Anathemas against Origen), attached to the decrees of the Fifth Ecumenical Council, A.D. 545, in Nicene and Post-Nicene Fathers, 2d ser., 14: 318).”

This passage is aimed straight at the teachings handed down from Yeshua (Jesus) the Christ to his disciples that mankind came from God and was destined to become one with God as he was one with God.

When the Jews tried to stone him for calling himself the son of God, Jesus responded by reminding them that were all gods. Later, just before Christ was crucified, he revealed in a prayer that he wanted his disciple to become one with God just as he was.

Jesus Prays for All Believers
John 17:20"My prayer is not for them alone. I pray also for those who will believe in me through their message,
21 that all of them may be one, Father, just as you are in me and I am in you. May they also be in us so that the world may believe that you have sent me.
22 I have given them the glory that you gave me, that they may be one as we are one:
23 I in them and you in me. May they be brought to complete unity to let the world know that you sent me and have loved them even as you have loved me.

A prominent theologian named Origen wrote around 250 AD about the pre-existence of the soul. He taught that the soul’s very source was God and that the soul was travelling back to oneness with God via the lessons learned in multiple lives. He taught that Christ came to show us what we can become. For centuries this was the mainstream view of Christianity but 300 years later it became a huge issue and the belief was made illegal because Emperor Constantine believed it was dangerous to the Empire to believe in reincarnation.

In his Masnavi, Rumi speaks about the "seventy-two forms I have worn".
Modern Sufis who embrace the idea of reincarnation include Bawa Muhaiyadeen and Hazrat Inayat Khan .

CHAUPAI
Those who quarrel in ego, they are far removed from the Lord.
O men of God ! Understand this that the Lord doth not reside in Vedas and katebs. |61|
He, who exhibits heresy in closing his eyes, attains the state of blindness.
By closing the eyes one cannot know the path, how can then, O brother! He meet the Infinite Lord? |62|
To what extent, the details be given? When one understands, he feels tired.
If one is blessed with millions of tongues, even then he feels them short in number, (while singing the Praises of the Lord) |63|